Archiv für Hydrobiologie und Planktonkunde
Author :
Publisher :
Page : 918 pages
File Size : 24,75 MB
Release : 1921
Category : Aquatic biology
ISBN :
Author :
Publisher :
Page : 918 pages
File Size : 24,75 MB
Release : 1921
Category : Aquatic biology
ISBN :
Author :
Publisher : CUP Archive
Page : 576 pages
File Size : 37,16 MB
Release :
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Author : Royal Norton Chapman
Publisher :
Page : 780 pages
File Size : 21,14 MB
Release : 1926
Category : Animal ecology
ISBN :
Author : George Stephen West
Publisher :
Page : 502 pages
File Size : 27,50 MB
Release : 1916
Category : Algae
ISBN :
Author : P.D. Armitage
Publisher : Springer Science & Business Media
Page : 579 pages
File Size : 31,54 MB
Release : 2012-12-06
Category : Science
ISBN : 9401107157
The dipteran family Chironomidae is the most widely distributed and frequently the most abundant group of insects in freshwater, with rep resentatives in both terrestrial and marine environments. A very wide range of gradients of temperature, pH, oxygen concentration, salinity, current velocity, depth, productivity, altitude and latitude have been exploited, by at least some chironomid species, and in grossly polluted environments chironomids may be the only insects present. The ability to exist in such a wide range of conditions has been achieved largely by behavioural and physiological adaptations with relatively slight morphological changes. It has been estimated that the number of species world-wide may be as high as 15000. This high species diversity has been attributed to the antiquity of the family, relatively low vagility leading to isolation, and evolutionary plasticity. In many aquatic ecosystems the number of chironomid species present may account for at least 50% of the total macroinvertebrate species recorded. This species richness, wide distribution and tolerance to adverse conditions has meant that the group is frequently recorded in ecological studies but taxonomic difficulties have in the past prevented non-specialist identification beyond family or subfamily level. Recent works, including genetic studies, have meant that the family is receiving much more attention globally.
Author :
Publisher : Academy of Natural Sciences
Page : 160 pages
File Size : 31,37 MB
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ISBN : 9781437955507
Author : Charles Wardell Stiles
Publisher :
Page : 904 pages
File Size : 50,52 MB
Release : 1920
Category : Acanthocephala
ISBN :
Devised by a famous Welsh poet, the Bardic alphabet called Coelbren has always seemed to hold great promise. But as long as nobody knew how to use the system for divination, it remained simply a relic of a bygone era. In this book John Michael Greer reveals the secrets of this esoteric alphabet, restoring the Coelbren to its rightful place as a powerful magical tool. Unlike the Ogham or runes, the Coelbren letters take their meaning directly from the sounds they represent. Providing the name, Welsh keyword, meaning, symbolism, pronunciation, and divinatory interpretation of each letter, this book shows how to use this unique system for divination and magic. You will also discover sample readings, scrying and meditation techniques, and tips for making your own Coelbren set. Writng systems have been used for magical power and mystical insight in spiritual traditions throughout history. This book shows how to engage in an effective divinatory practice with an alphabet that is mysterious in its origins but undeniable in its power.
Author : National Institutes of Health (U.S.)
Publisher :
Page : 1130 pages
File Size : 42,50 MB
Release : 1920
Category : Medicine, Experimental
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Author :
Publisher :
Page : 894 pages
File Size : 25,23 MB
Release : 1920
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Author : United States. Entomology Research Division
Publisher :
Page : 1702 pages
File Size : 25,61 MB
Release : 1965
Category : Agriculture
ISBN :
Set includes revised editions of some issues.